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Message: <blockquote data-quote="Flamestrike" data-source="post: 8669282" data-attributes="member: 6788736">No, Im not. Its the rule for ALL reactions taken from the PHB. The trigger for your reaction, must be a perceivable circumstance.Someone else thinking something doesnt qualify as a trigger. You need to know the trigger is happening to take your reaction.It's like if your reaction trigger is 'When the Rogue drinks a potion, I cast a spell'. If the Rogue drinks a potion while Hiding from you, your reaction doesnt trigger.The requirement comes from the rule for reactions generally in the PHB. A reaction can only trigger on a perceivable event.Vecna doesnt know his opponent is casting a spell. So he cant use his reaction to counter it.If he had some means of knowing (an active Detect Magic, or Read Thoughts for example) we could talk.No, it's only if Vecna knows both are true. Vecna only knows 1 of those preconditions are met (a creature I can see). He doesnt know the second one is met (he's casting a spell) so he cant Dread Counter it.You know when you've been hit with an attack. If your trigger for a reaction is something you dont know is occurring, you cant trigger a reaction to it.</blockquote>